code: def get_differential_var_str(text):
      for i in range(1, len(text)):
          c = text[i]
          if not (c == " " or c == "\r" or c == "\n" or c == "\t"):
              idx = i
              break
      text = text[idx:]
      if text[0] == "\\":
          text = text[1:]
      return text
  
imports: from importlib.metadata import version
  import sympy
  from sympy.external import import_module
  from sympy.printing.str import StrPrinter
  from sympy.physics.quantum.state import Bra, Ket
  from .errors import LaTeXParsingError
label_desc: Use image node_id 24 for calling a global function with example usage: get_differential_var_str(text) and returns: text